Nokia 7900 Crystal Prism User Guide - Page 10

■ Enhancements A few practical rules about accessories and enhancements: • Keep all accessories and enhancements out of the reach of small children. • When you disconnect the power cord of any accessory or enhancement, grasp and pull the plug, not the cord. • Check regularly that enhancements installed in a vehicle are mounted and are operating properly. • Installation of any complex car enhancements must be made by qualified personnel only. Warning: Use only batteries, chargers, and enhancements approved by Nokia for use with this particular model. The use of any other types may invalidate any approval or warranty, and may be dangerous. For availability of approved enhancements, please check with your dealer. When you disconnect the power cord of any enhancement, grasp and pull the plug, not the cord. ■ Access codes Select Menu > Settings > Security to set how your phone uses the access codes and security settings. • Keypad lock (keyguard) prevents accidental keypresses: 1. To lock the keypad, with the fold open, select Menu > * within 3.5 seconds. 2. To unlock the keypad, with the fold open, select Menu > * within 1.5 seconds. To answer a call when the keypad is locked, press the call key. When you end or reject the call, the keypad locks automatically. You can also select Menu > Settings > Phone > Automatic keyguard or Security keyguard > On or Off. If the security keyguard is on, enter the security code when requested. • The security code (5-10 digits) helps to protect your phone against unauthorised use. • The PIN code, supplied with the SIM card, helps to protect the card against unauthorised use. • The PIN2 code, supplied with some SIM cards, is required to access certain services. 10 General information